Hydraulic system for recirculating liquid

Details Hydraulic system for recirculating liquid Hydraulic system for recirculating liquid

1984-10-19

1987-04-14

Goldberg, E. A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 15, 346140R, 239 3, 239708, G01D 1518, B05B 500

Patent

active

046582681

ABSTRACT:
A hydraulic system, suitably an ink supply system for an ink jet printer, wherein a first pump conveys ink under pressure from a reservoir to a work head and a gear pump returns unused liquid from a collector at the work head to the reservoir. A bleed line connects an outlet from the first pump to an inlet to the gear pump. Accordingly, there is a flow of liquid via the bleed line such that the gear pump applies sufficient suction to the collector to draw air or a mixture of air and unused liquid therefrom. The flow is also sufficient to ensure adequate lubrication of the gear pump. The first pump may also be a gear pump, in which case the two pumps are formed as a double-ended pump.

REFERENCES:
patent: 4067020 (1978-01-01), Arway
patent: 4314264 (1982-02-01), Bok et al.
patent: 4320407 (1982-03-01), Goldis et al.
patent: 4399446 (1983-08-01), McCann et al.
patent: 4413267 (1983-11-01), Hein
patent: 4422085 (1983-12-01), Sumitomo et al.
patent: 4460904 (1984-07-01), Oszczakiewicz et al.
patent: 4464668 (1984-08-01), Komai et al.

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